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(11)

EP 3 949 545 A1

(12)

(43) Date of publication: 09.02.2022 Bulletin 2022/06 (21) Application number: 20722824.8 (22) Date of filing: 06.04.2020

(51) International Patent Classification (IPC):  H04W 52/02(2009.01) H04W 68/02(2009.01) H04L 5/00(2006.01) H04J 13/00(2011.01) H04W 28/02(2009.01) (52) Cooperative Patent Classification (CPC): H04J 13/0029; H04J 13/0062; H04L 5/0048; H04W 52/0229; H04W 68/02; Y02D 30/70 (86) International application number: PCT/US2020/026946 (87) International publication number: WO 2020/206458 (08.10.2020 Gazette 2020/41)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 04.04.2019 US 201962829588 P (71) Applicant: Apple Inc. Cupertino CA 95014 (US)	(72) Inventors: YE, Qiaoyang Cupertino, California 95014 (US) CHATTERJEE, Debdeep Cupertino, California 95014 (US) MOROZOV, Gregory Cupertino, California 95014 (US) (74) Representative: Rooney, John-Paul  Withers & Rogers LLP 2 London Bridge London SE1 9RA London SE1 9RA (GB)